In a pot add 2 lt of water, pork belly, salt (1.5 tbsps), the mint, bay leaf, and garlic. Bring to a boil then simmer until the pork belly is completely tender, approximately 1.5 to 2 hours. Remove the pork belly, drain it, and pat it dry thoroughly with paper towels. In a deep skillet or wok with vegetable oil heated to 350°F to 375°F (175°C to 190°C), fry the pork belly in batches until golden and crispy on the outside, approximately 4 to 5 minutes per side. Remove and let it rest on paper towels before building the sandwich.